[5] When Sir John Tooley, the General Director at Covent Garden, saw the play, he offered Moshinsky a post as a staff producer for The Royal Opera.
[6][7] In 1975, Moshinsky made his operatic debut at the Royal Opera House with "a stripped-down, low-budget production of Peter Grimes [with Jon Vickers] which won enormous popular and critical success.
[8] For the Lyric Opera of Chicago he directed Samson, The Bartered Bride, Nabucco, Lohengrin, The Pirates of Penzance, Cavalleria rusticana and Pagliacci, Samuel Barber's Antony and Cleopatra.
At English National Opera in 1982, he directed the British premiere of Le Grand Macabre as well as Die Meistersinger von Nürnberg and The Bartered Bride.
Later, he directed Plácido Domingo in Simon Boccanegra at Covent Garden, Los Angeles and at the National Centre for the Performing Arts (NCPA) in Beijing.
For the theatre stage, his credits included Troilus and Cressida and Thomas Bernhard's The Force of Habit at the Royal National Theatre in 1976, and, elsewhere in London: Three Sisters and Robert Storey's Light Up the Sky in 1987, Ivanov, Much Ado About Nothing and Ronald Harwood's Another Time with Albert Finney (all in 1989), Matador (1991), Becket (1991), Ronald Harwood's Reflected Glory (1992), Cyrano de Bergerac (1992–1993), Richard III (1999), plus Shadowlands with Nigel Hawthorne in the UK and on Broadway (1990–1991).
Non-operatic works, mainly for the BBC, include a number of Shakespeare's plays, televised between 1980 and 1985: All's Well That Ends Well, A Midsummer Night's Dream, Cymbeline with Helen Mirren, Coriolanus with Alan Howard and Irene Worth, and Love's Labour's Lost.